Portion of floor cleaning machine



FIG. 1 is a perspective view of a portion of floor cleaning machinewhich embodies our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof,

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view.

Portions of the portion of floor cleaning machine shown in broken linesform no part of the claimed design.

CLAIM The ornamental design for a portion of floor cleaning machine, asshown and described.